cc: Remove some unnecessary const scoped_refptr&.

cc/surfaces/surface_display_output_surface.cc

Index: cc/surfaces/surface_display_output_surface.cc
diff --git a/cc/surfaces/surface_display_output_surface.cc b/cc/surfaces/surface_display_output_surface.cc
index 642ec9f94b6faeb0021fdc8625f84e2a0f1f637f..dfb491ede62bb7a5c41755c89514d399b93eb950 100644
--- a/cc/surfaces/surface_display_output_surface.cc
+++ b/cc/surfaces/surface_display_output_surface.cc
@@ -17,9 +17,10 @@ namespace cc {
 SurfaceDisplayOutputSurface::SurfaceDisplayOutputSurface(
     SurfaceManager* surface_manager,
     SurfaceIdAllocator* allocator,
-    const scoped_refptr<ContextProvider>& context_provider,
-    const scoped_refptr<ContextProvider>& worker_context_provider)
-    : OutputSurface(context_provider, worker_context_provider),
+    scoped_refptr<ContextProvider> context_provider,
+    scoped_refptr<ContextProvider> worker_context_provider)
+    : OutputSurface(std::move(context_provider),
+                    std::move(worker_context_provider)),
       display_client_(NULL),
       factory_(surface_manager, this),
       allocator_(allocator) {